For planting suggestions, I know it's not among the more "desirable" plants, but planted densely sunset hygro does look nice and bushy in the back, and a variety of more interestingly colored plants in spots to break up the overall look makes it all the more pleasing to the eye. That's what I'm working towards now, and the hygro certainly fills in fast under good light and CO2. Rotala is my favorite stem plant for breaking up the backdrop, along with some nicer reds, which I'm working on acquiring and propgating myself right now. Hornwort can look nice too when placed right, but getting a little frustrated with mine wanting to float free of the sand, mostly thanks to a whiptail catfish my wife just HAD to have, LOL! Wysteria makes for nice breaks in the "treeline" as well. My own lights are T5 HO, 8x80W 6,500K, running 5 of them for 9 hours per day trying to get the HC to spread into a nice carpet, but it isn't going well, again mostly thanks to that catfish. I think that little guy is likely to end up in the 20 gallon tank again shortly until things fully root in the 100g and take off! As for the discus, not here man... my wife saw the price tags, LOL!!! Besides, my tap water is liquid rock and I'm having issues with that in the tank anyhow. Beginning to think hard about an RO/DI unit as my next major tank expense! Looks great with the additional substrate man, real nice work.